There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Top 50 richest people in Zimbabwe. A local firm X Research and Intelligence has released a list of Zimbabweâs Top 50 richest personalities. On top of the pile is telecommunications guru Mr Strive Masiyiwa, followed by business magnate Mr Philip Chiyangwa, Mr Shingai Mutasa, Mr Moses Chingwena and Televangelist Prophet Emmanuel Makandiwa.